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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Alameda Ridge ： ウィキペディア英語版 Alameda Ridge The Alameda Ridge is a large gravel bar located in Portland, Oregon, United States. ==Geologic history== Alameda Ridge was formed between 15,000 and 13,000 years ago at the end of the last ice age when the ice dam containing Glacial Lake Missoula collapsed some 40 times, causing some of the largest floods known on earth. The flood waters spilled across Idaho and eastern Washington, surged down the Columbia River and through the Gorge, flooding the Willamette Valley as far south as Eugene, Oregon. These floods covered the city of Portland, Oregon in approximately of water, carving out Sullivan's Gulch, the large ravine that holds Interstate 84, and depositing a large volumes of unconsolidated silt, sand, gravel, and boulders.〔(Waymarking.com ) - "Missoula Flood Glacial Erratic, Tualatin, Oregon"〕〔(USGS Cascades Volcano Observatory )〕 As the west-flowing waters rushed around Rocky Butte, a volcanic cinder cone in the Boring Lava Field, sediments were deposited on the west side of the butte forming an approximately 100 to high bar that became Alameda Ridge. The ridge extends west roughly from Rocky Butte to approximately 15th Avenue and Skidmore Street. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Alameda Ridge」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.